获取用户IP

/** * 获取用户的ip*/

   private String getRemoteAddr(HttpServletRequest request) {
    String ip = request.getHeader("X-real-ip");
    if(ip ==null|| ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("x-forwarded-for");
    }
    if(ip ==null|| ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
    }
    if(ip ==null|| ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if(ip ==null|| ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_CLIENT_IP");
    }
    if(ip ==null|| ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_X_FORWARDED_FOR");
    }
    if(ip ==null|| ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
    }
    return ip;
}